Cut-off valve.



PATENTED FEB. 26, 1907.

,ay/fm maw/ '/z J. H. WILLIAMS. CUT-OFF VALVE.

APPLICATION FILED MAY 14. 1906.

A 'Troie/vf ys UNTED STATES PATENT ernten.

CUT-OFF VALVE.

.peccetien of Letters Patent.

Patented Feb. 26, 1907.

Application filed May 14. i906. Serial No. 316.783.

To all IN1-fm1I if muy concern.

Be it known that l, JOHN H. l'VrLLIAMs, a citizen of the United States, residing :it New London, in the county of Henry and State of Iowa, have invented a new and useful Cut- O Valve, of which the following is :1. speciiiorder to provide direct ports 16 between the cation.

This invention relates to valves for steamengines, and has for its principal object to provide a novel form of valve. which will be perfectly v balanced, thus avoiding undue friction between the valve and its seat.

A. further object of the invention is to provide a structure in which the chest is longer i than the cylinder and in which the two are connected by direct ports leading in straight lines, thus avoiding the vvaste'oic steam incident to the filling of the usual indirect ports of ordinary engines.

A still further object of the. invent-ion is to n rovide a novel form of valve in which the steam may be cut ofi at any desired oint in the stroke, the main 'valve being in tie form 0 equal at all peints, and frictional Wear, due to olla hollow ported cylinder and an auxiliary cut-oi? valve being arranged within the main vulve and being movable. independently thereof in order to eii'ect a more or less perfeet cut-oi?, as desired.

With these and other objects in view, as ill more fully hereinafter appear, the. invention consists in certain novel features of construction and arrangement of warts hereinai'ter full)Y described, illustrated in the accompanying drawings, and particularlgyr pointed out in the appended claim, it being under-v stood that'verious changes in the form, proportions, sirze, and minor details of the structure :may be made Without departing from the spirit or sacrificing any of the advan tages of' the invention.

in the accom penying drawings, Figure 1 is a sectional eleve-tion of the steam-chest and l s portion oi the cvlinder'of an engine constructed and erranged in accord ance with the J invention, the piston being shown at the end of the in or crank-shaft stroke. Fig. 2 isa sinilar view showing th r pistcnet the end of the oustrclfe. Fig. 3 is a transverse sectional elevation through the chest on the line so 3 of Fig. 2. Fig. 4. is a. detail oerspective view of the main valve detached. Fig. 5'is r.

similar vier.' of the cut-oil' viive.

Similar numerals of reference are employed to indicate corresponding arts throughout the several figures of the rnwi t t 28 ratecpera ing-s em ings.

In 'the drawings there is shovvn a portion of a cylinder 10 and a portion of the piston 1l,

the latter being provided with the usual conV nections.

r'inove the cylinder is a steam-chest 15, winch is of greet er length than the cylinder in cylinder and the chest. These ports extend in straight lines at e right angle t) the longitudinal axis of the cylinder and in the largest engine need not he nore than an inch in length as distinguished from the ordinary type of engine where the cylindenports are concentrated at about the center of the valve-seat in the steam-chest, the ports being unnecessarily long and being curved, so that the flow of steam is retarded, and-dt each stroke the volume of steam necessary to fill the ports is Wholly wasted.

The steam-chest is bored out to form a cylinder 17, in which is arranged a cylindrical valve 1S, the latter fitting snugly Within the cylinder, so that the steam-pressure will be plurality of ports 19, leading through the 'Wall of the cylinder in direct lines at right angles to the longitudinal axis of the valve; The central portion of the cylinder is re duced in diameter, fornring an enlarged annular spece 20, .vth which the exhaust-port 21 communicates, and when one of the cylinder-ports is in communication with a, set of steam-ports 19 the other cylinder-port is in communication with the exhaust 21.

The steam or other fluid under pressure never flows to the center of the steam-chest, but always remains at the o posite ends thereof. The steam is vadnitted) through an inlet-pipe 22 to a port 23 above the cylmder, and said port comnunicates with the oppo site ends of the cylinder 17 through vertical ports 24, so that each. set of valve-ports has en independent steam-supolv.

Arranged within the bore of the n? ain valve 18 is a cut-off valve 26 in the form of a solid plunger. VThis plunger is of a length equal to the distance between the inneror adJacent walls of the two sets of ports 19,.as willbe evident on reference to Figs. 1 and 2, and the cut-ofi valve is rovided with an operating-stem 27, vwhile t e main valve has a sepaof the piston.

cut-olf valve may be moved to the right in 'either valve, and there is no excessive fric? T -o mein va *Je and the out-oil. valve are l connected to independent valve-operaiing l mfchzliisnis, which may V- o? any (lefiired i cone'irifetion and which opviel-.ie ii sich infmner thin, when tive pars are in lle 'position shown in Fig. 1 .and the leftfhanri end of iii?" -cylinder is taking eteeintlie valve 26 mii-v l1@- moved to the left at m15* desired speer* der t0 cut of? the How of sie-am without .lsturbing the position of' the n'min valve, so that the exhaust-peri at he opposite en: the cylinder may be left fully open to po .the free escape of the dead steam in advance Then moved to the opposite osition, as shown in Fig. 2, :ind 4he 'rightliand end of the cylinder is taking slee-.11, the

order to out off without changing the noxition of the exhaust-port :it the opposite end of the clnder.

It vwill be noted that the m'cssnre i1-ene at the opposite ends of the valves are substantially equal, with the exception, of course, of the limited area occupied by the Steins a2 ille crank-shaft end of the Valves; but this will not be sulcient to retard the movon'ient of tional Wear due to Swain-pressure, as'in the cjflinfifa', the stezn'i-i'rliest being pi'midef? with :a o iln'l'ieal here and arranged o receive sti-fai at. molli ends :1nd to exhaust :it the center, a hollow cylinfliicai valve arranged in the steen-chest and orovided v,vithports to permit- Lhe passage ol the steam fTou the enfle. of the chest lo the e ;lin(ier-ports, Sayid valve having a reduced central portion in eonslant communication with the exhaust, a solid Cutoff valve arranged within the hollo` valve sind conrollii'ig the ports of the latter, und independent valve-stems connected to the two valves. i

In testimony tlmt- I Claim the foregoing :is

im' own l have hereto afiijxed nu" sii-#nature in the presence of two witnesses.

om H. WiL-Lune.

Yi'itnessos I. H. HRDPEHN, Ross WALKER.

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